Intangible and Other Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 5,992	$ 12,700
Less accumulated amortization	(4,977)	(6,957)
Intangible assets, net	1,015	5,743
Other assets	1,933	42
Intangible and other assets	2,948	5,785
Capitalized patent and license costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	5,992	6,799
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross		$ 5,901